XnView Software

One more data point. Running Google's cwebp command line converter successfully converts all these files to webp. They are, of course, larger than the original png files

I've attached all the files.

I'm running XnConvert for MacOS on Sierra btw.

I can't speak for those apps you mention. But they open fine in Mac preview, Chrome, and other apps.

Reviewing the files now, they are all very small png files which wouldn't really benefit from conversion to webp anyway ...

Hi there,

I just converted a folder of 81 jpgs and pngs to webp, and XnConvert said it had 6 errors in the process. Indeed, only 75 files were converted to webp.

I can see which files failed, but I'm not sure why they failed. Is there more detail somewhere?

Thanks